public class Example {

        String str=new String("good");
        char[] ch={'a','b','c'};
        public static void main(String args[]){
            Example ex=new Example();
            ex.change(ex.str,ex.ch);
            System.out.print(ex.str+" and ");
            System.out.print(ex.ch);
        }
        public void change(String str,char ch[]){
            str="test ok";
            ch[0]='g';
        }

}
